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Hierarchical MoP/Ni2P Heterostructures on Nickel Foam for Efficient Water Splitting

Abstract

Water electrolysis has been considered as one of the most effective, secure and sustainable ways to produce clean hydrogen energy to resolve the looming energy and environmental crisis. Exploring bifunctional catalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) with high efficiency, low cost, and easy integration is extremely crucial for future renewable energy systems. Herein, we report the in-situ controllable synthesis of hierarchical MoP/Ni2P heterostructures on 3D Ni foam (MoP/Ni2P/NF) and its application as an efficient bifunctional electrocatalyst for water splitting. The hierarchical heterostructures are achieved by a facile hydrothermal approach to obtain the Mo-based/NF precursor, followed by a subsequent in-situ phosphorization procedure. Through manipulating the concentration of ammonium molybdate for preparation of the precursor as well as the phosphorization temperature, the optimal MoP/Ni2P/NF can efficiently catalyze both OER and HER in alkaline electrolyte. The superior performance with robust durability is mainly attributed to unique hierarchical heterostructures and collaborative advantage of bimetallic phosphides, as well as 3D porous conductive substrate. As an integrated high-performance non-noble electrocatalyst for overall water splitting, MoP/Ni2P/NF electrode presents a cell voltage of only 1.55 V to achieve a current density of 10 mA cm−2 in alkaline solution. This work highlights the importance of design and construction of hierarchical heterostuctures for efficient overall water splitting.

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Publication details

The article was received on 28 Apr 2017, accepted on 10 Jul 2017 and first published on 11 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA03669H
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Hierarchical MoP/Ni2P Heterostructures on Nickel Foam for Efficient Water Splitting

    C. Du, M. Shang, J. Mao and W. Song, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03669H

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